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Table 2 Comparing the blood group O vs. non-O regarding placental malaria infection for primi- and multiparae for four different studies

From: ABO blood group and the risk of placental malaria in sub-Saharan Africa

   Primiparae Multiparae Total
   N OR 95% CI N OR 95% CI N OR § 95% CI
Loscertales et al. Non-O 38    58    96   
  O-group 50 3.0 1.2-7.3 52 0.8 0.3-1.7 102 1.5 0.9-2.7
Senga et al. Non-O 107    221    328   
  O-group 96 2.2 1.1-4.3 213 0.6 0.4-1.0 309 0.9 0.6-1.4
Adam et al. Non-O 63    102    165   
  O-group 51 # # 77 0.4 0.1-1.8 128 0.3 0.1-1.1
Present study Non-O 34    106    140   
  O-group 50 0.3 0.1-1.8 188 0.7 0.3-1.8 238 0.6 0.3-1.3
  1. § If the stratified ORs (for primi- and multiparae) indicate that parity modifies the effect of blood group O on the risk of placental malaria, the combined ORs (for All) are printed in grey italics as they should not be used for interpretation of the findings
  2. # In the Adam study there was no active placental parasitaemia in primiparae with blood group O therefore the OR could not be calculated